Piezo discs are mainly made of copper material, highly durable and can withstand most weather conditions. Piezo discs are easy to install and can be attached to the surface of an instrument. The piezo disc are lightweight and do not add significant weight to the instrument. Features -Color:Assorted Color -Material:Copper -Size:2.70X11.50X0.10cm/1.06X4.52X0.04in - Piezo discs are compatible with a wide range of amplifiers and sound systems, a stylish choice among musicians. - Piezo discs are ideal for live performances and recording sessions, as they provide a clear and . - Piezo discs, easy to install, allow for low-maintenance and do not require frequent replacement or repair. - Piezo discs are highly efficient and can produce a high output signal with minimal distortion. - Copper piezo discs are resistant to , ensuring a clean and noise-free signal. Package list: 20 x piezo discs